The size looks fine to me but I suppose you could always shim it with a foundation made of styrene strips, wood or even foamcore. British loading gauge was notoriously narrow until the later 20th century and model railroad buildings are deliberately compressed in many cases, so it seems about normal to my eyes.
Watching rail fan videos, even in the eastern US will often have you wondering how train crews keep the gloss on the paint with some of the tight clearances they navigate.
Watching rail fan videos, even in the eastern US will often have you wondering how train crews keep the gloss on the paint with some of the tight clearances they navigate.